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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '410a5364286b4eb787028644e1002592b624672a46a75febd6a9cf3d9c911624' 
  AND token = 'XZsWtY3xN1lb6L9zFq6QH9lQjgX+fSGVPWyK0Ts2lAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}